出典の根拠 Tobunken's 彩色DB records 丹 (red lead, Pb₃O₄) in Nara-period documents such as the Hōryū-ji inventory.
関係 丹 is the historical lead-oxide pigment behind the color name 丹色; the name long outlived the specific material.
注意 Lead-red pigment context only. It is not a measured value, and 丹色 today is a digital approximation.
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